通过机械振动抑制摩擦
Suppression of friction by mechanical vibrations
摘要：
已知机械振动会影响摩擦滑动和相关的粘滑模式，有时会导致摩擦力的急剧减小。这个问题是相关的纳米摩擦学的应用，并了解地震触发的小动态扰动。我们研究了水平驱动的顶板和垂直振荡的底板之间的排斥粒子的动力学。我们的数值计算结果表明，抑制高耗散粘滑制度在一个明确定义的频率范围内，取决于振动振幅，正常施加的负载，系统的惯性和阻尼常数。我们提出了一个理论解释的数值结果，并推导出一个相图，指示摩擦被抑制的参数空间的区域。我们的研究结果可以定义更好的策略，机械控制摩擦。
英文摘要：
Mechanical vibrations are known to affect frictional sliding and the associated stick-slip patterns causing sometimes a drastic reduction of the friction force. This issue is relevant for applications in nanotribology and to understand earthquake triggering by small dynamic perturbations . We study the dynamics of repulsive particles confined between a horizontally driven top plate and a vertically oscillating bottom plate. Our numerical results show a suppression of the high dissipative stick-slip regime in a well defined range of frequencies that depends on the vibrating amplitude, the normal applied load, the system inertia and the damping constant. We propose a theoretical explanation of the numerical results and derive a phase diagram indicating the region of parameter space where friction is suppressed. Our results allow to define better strategies for the mechanical control of friction.
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